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Quote:
Originally Posted by
JaimeeÂ

JMJ so what would you say is the cause of OPK- followed by OPK+ after a clear temp shift? Faulty tests?   It seems like it happens semi-frequently just based on the posts I've seen here over the last few months... are OPK's really that inaccurate?
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I don't know much about what causes OPK's to read positive or negative. I know you're supposed to assume that you're ovulating after first positive, so I assume that the normal luteal phase hormones can sometimes trigger positive OPK's, and I see that happening. I've also seen people have positive OPK's and fertile CM and then no thermal shift, and I assume that in those cases, the woman's body gets all ready to ovulate and then does not actually ovulate. So, when you combine the fact that you can get positive OPK's long before you ovulate, you can get positive OPK's after ovulation, and these are common enough that I see them regularly (granted, from a biased sample of women who are TTC and confused. The ones for whom it's working probably aren't as likely to ask for help.), I just have a hard time putting a lot of trust in them.